or
or
The answer provided, 18, is not correct. The correct calculation involves determining the number of combinations of 6 questions taken 3 at a time, which can be calculated using the combination formula:
C(n, r) = n! / (r! * (n - r)!)
Plugging in the values:
C(6, 3) = 6! / (3! * (6 - 3)!) = 6! / (3! * 3!)
Calculating that:
Thus, C(6, 3) becomes:
720 / (6 * 6) = 720 / 36 = 20
Therefore, the correct answer is 20, not 18.
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